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Why is this in "Prusa i3 and variants"
will you be converting i3?
Printing and milling Two extremes
......Printing -- little forces on mechanics all axes
......Milling --- extreme forces on the mechanics all axes ---- important

Folgertech buildplate material
Aluminium composite material (ACM), are flat panels consisting of
two thin aluminium sheets bonded to a non-aluminium core.
The standard ACP core is polyethylene (PE) or polyurethane (PU).
The older FT-5 used Melamine sheets
Now all use ACM
See

How to:
attach bowden extruder directly to hotend
without E3D type connection?
E3D type heat sink on right (in photo below) with stepped transition
Bowden extruders at left, Bowden hotends in center
Threads in all are the type found on PTFE tubing adapters
Mount must:
be a heat break to keep extruder cool
have a 1.75mm bore to conduct filament into hotend
all metal (avoid PTFE)
Ideas

Gonna need a new heater
something like this (maintain 24v supply)
16" X 16" 400 X 400mm 24V 200W w/ 3M JSR2 Kapton Heater Heating Pad Mat
200W will not put too much of a strain on the 15amp Ender power supply
and a piece of 400mm x 400mm glass for the top
and a piece of something for the bottom bed
If you want it to heat up faster 120V AC heater and Solid State Relay to control it
other

I have a CubeX Duo that I have not upgraded yet.
Did you preserve the extruder PC board above and behind extruders
It appears to have some components on it?
Do these play well with other extruder drivers?
why RUMBA and 24V?

Flyingbear p902 has huge bed cantalever
they even dicontinued it with p905 that supports bed on two ends
Consider linear rails
read thru:
a lot of good build techniques there
The digital dentist knows how to build a printer

What Firmware Marlin 1.1.9
What Software?
------ send g-code to printer
------ Generate laser paths and control laser ON/OFF
Find a pin that you can PWM at 5V
hook that up to laser TTL
Find g-code that controls that pin
Tell software the command to control laser

Laser should be connected to 12V supply
from DZT 's Store website ---- PWM/TTL:support . TTL 0v off ,5v on
so supplying 5V to the TTL should trigger (turn ON) the laser
The TTL is modulated by a PWM signal from controller to get various power output
(longer pulse width --- more laser ON time)
What firmware and software are you using?
Many of SW programs allow selection of how laser is t

Why are you using this FYSETC great unknown board
with Atmega2560 CPU (8 bit)
and unknown firmware Klipper (not much of a user base to get help )
six drivers (but there is only ONE motor on Z-drive)
?? are you modifying Z to Three motor drive??
the FYSETC F6 V1.3 board detailed at:
https://wiki.fysetc.com/F6_V1.3/
Klipper (Rasp-Pi part) will be running under OctoPrint in Rasp-Pi
feeding

"linear rails run in pairs are hard enough to keep perfectly parallel and true to each other
adding a third would add another level of complexity which I'm not sure I would have the patience for."
One linear rail would replace your dual rod guide .... so only three rails
2 rods parallel --- parallel to two other 2 rod assemblies ---- I see six vectors going every witch way ---
?? Over -

I've got a Vaeder V-struder feeding filament on DaVinci 1.0
The belt solution, which drives
filament using belts. This allows for great torque on your filament, without
slipping or damaging the filament. The geared solution gives enormous torque
from even a simple stepper motor.

The TTL trigger is not a voltage dependent control.
The trigger pins normally are pulse width modulated (PWM) to control laser output
More time ON ( at 5V) the greater the laser ON - more power.
So you have to set up your control pin to PWM
or select a pin that can set PWM frequency
Read